Phonograph record and method of treating same



Patented June 3, 1930 NITED STATES RUDOLPH KNOPI, OF BROOKLYN, NEW YORK PHONOGRAPH RECORD AND METHOD OF TREATING SAME Application filed February 2, 1928. Serial No. 251,318.

This invention relates to improvements in phonograph records and a method of treating the same, and has particular reference to a record such as used for synchronous operation with moving picture films.

It is well known to operate a phonograph record in synchronism with a moving picture film. For various reasons, such as breaking of the film and'removal of portions thereof by censorship, the actual length of the original film made in conjunction with a phonograph record is changed and consequently the film and record can no longer be operated in synchronism.

In order to avoid the above diiiiculty and thereby retain the synchronous operation of the film and record, it is proposed, by the present invention, to provide the record with means whereby a stylus moving in the phonic groove, during the playing of the record, is caused to bypass that portion of said groove corresponding to the part of a film which has been removed.

The inventive idea involved is capable of receiving a variety of expressions, some of which, for purposes of illustration, are shown in the accompanying drawing, wherein--- Figure 1 is a plan view of a disc record showing the application of the invention thereto;

Figure 2 is a fragmentary sectional view; and

Figure 3 is an elevation of a cylindrical record, illustrating the inventive idea.

More specifically, the numeral t indicates a disc record and 5 a cylinder record both of which are formed with a record or phonic groove 6 in any manner well known in the art. The phonic groove may be made in con junction with the production of a moving picture film and reproduced in conjunction therewith through the medium of known synchronizing mechanism.

Should it be found necessary to remove or cut out any portion of a film for any one of various reasons, it becomes essential, in order to again operate the film and record in synchronism, to similarly treat the record so that the portion of the phonic groove therein, corresponding to the length of film removed, will not be traversed by the stylus. In order to accomplish this purpose, the two points 7 in .the phonlc groove 6, forming the beginning and ending of the portion thereof which would be traversed in synchronism with the length of film to be removed, are joined by a guide groove 8 or its equivalent. This groove is preferably made deeper than the groove 6 in order to better assure the entry of a stylus into the same and to prevent said stylus from again entering the phonic groove until the exit end of the groove 8 is reached. Said groove 8 intersects or crosses that portion of the phonic groove between the points mentioned and by guiding the stylus from one point to the other causes it to by-pass said portion and thereby to maintain the record in synchronous operation with the film when the same are beinw reproduced.

What is claimed is A phonograph record having a phonic groove, and a guide groove, the latter groove intersecting said phonic groove to bypass a stylus across a portion thereof at an intermediate interval in the playing of the record, the end of said guide groove first engaged by the stylus being closer to the outer convolution of: the record groove than the opposite end thereof.

In testimony whereof I have aflixed my signature.

RUDOLPH KNOPP. 

